wraplog

closure_stretch.js

var wrapLog = function (callback, name) {
  //var args = callback.apply(null,arguments);
  //console.log(arguments);
  //console.log(args);
  //console.log(arguments[0]);
  //console.log(arguments);
  return function() {
    //console.log(arguments);
    //console.log(callback.apply(null,arguments));
    //var arg2 = 1, arg1 = 2;
    console.log(name+"("+arguments[0]+","+arguments[1]+") => "+callback.apply(this,arguments));
  };
};

var sum = function (a,b) { return a + b; };
var logSum = wrapLog(sum, "sum");

logSum(5,3); // sum(5,3) => 8
logSum(3,2); // sum(3,2) => 5